EP0316977B1 - Procédé de bobinage - Google Patents

Procédé de bobinage Download PDF

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Publication number
EP0316977B1
EP0316977B1 EP88202368A EP88202368A EP0316977B1 EP 0316977 B1 EP0316977 B1 EP 0316977B1 EP 88202368 A EP88202368 A EP 88202368A EP 88202368 A EP88202368 A EP 88202368A EP 0316977 B1 EP0316977 B1 EP 0316977B1
Authority
EP
European Patent Office
Prior art keywords
bobbin
yarn
commencement
time
series
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP88202368A
Other languages
German (de)
English (en)
Other versions
EP0316977A1 (fr
Inventor
Luigi Colli
Roberto Badiali
Nereo Marangone
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Savio SpA
Savio Macchine Tessili SpA
Original Assignee
Savio SpA
Savio Macchine Tessili SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Savio SpA, Savio Macchine Tessili SpA filed Critical Savio SpA
Publication of EP0316977A1 publication Critical patent/EP0316977A1/fr
Application granted granted Critical
Publication of EP0316977B1 publication Critical patent/EP0316977B1/fr
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/42—Control of driving or stopping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
    • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
    • B65H63/036—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the combination of the detecting or sensing elements with other devices, e.g. stopping devices for material advancing or winding mechanism
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/08—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to delivery of a measured length of material, completion of winding of a package, or filling of a receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • This invention relates to a bobbin winding method.
  • the improvement according to the invention enables the productivity of the winding operation to be increased and unproductive times to be eliminated or shortened.
  • the winding operation consists substantially of transferring the yarn from a starting package and winding it on a rigid tube in order to form a structure wound in the form of cross turns and known as a bobbin, and during said transfer clearing the yarn of its imperfections and defects such as lumps, groups, naps, weak points, flocks etc. Said defects are eliminated by cutting out the defective portion and joining the yarn ends.
  • This joint can be made either by a proper knot such as a fishermans knot or a weavers knot produced by a mechanical knotter, or by a pneumatic or friction joint in which the fibres of the cut ends are untwisted, intermixed and then retwisted to thus restore continuity to the cut yarn without introducing the negligible irregularity represented by an actual knot.
  • a proper knot such as a fishermans knot or a weavers knot produced by a mechanical knotter
  • a pneumatic or friction joint in which the fibres of the cut ends are untwisted, intermixed and then retwisted to thus restore continuity to the cut yarn without introducing the negligible irregularity represented by an actual knot.
  • yarn clearing The removal of yarn defects is commonly known as yarn clearing in that the defect is detected by a yarn clearer which is sensitive to yarn defects and can either itself break the continuity of the yarn or operate a separate cutting member.
  • any discontinuity in the yarn causes the bobbin to undergo braking so that it stops, the yarn ends are picked up by mobile suckers and moved to the joining devices or knotters, the joined yarn is returned to its normal position and winding is recommenced, the bobbin and its drive roller being driven up from rest to the operating speed, which is generally of 600-1600 m/minute.
  • the winding speed is determined - within the limits of the possible winding machine performance - by the quality and count of the yarn to be wound.
  • the overall productivity of the operation is determined by the winding speed, the time taken by the overall intervention cycle and the actual number of interventions to be made.
  • the bobbin is normally driven by a rotating roller - of right cylindrical or slightly tapering conical shape - which is kept in contact along a generatrix common to the two members.
  • the technical problem with which the present invention deals derives from the fact that during the winding operation the rotating roller does not change its shape or size, whereas the bobbin continually changes its size due to the increasing amount of yarn wound on it.
  • the peripheral speed of the drive roller is substantially equal to the linear winding speed of the yarn.
  • the yarn is guided so that it winds on the bobbin in a spiral arrangement using a yarn guide of various shapes or spiral grooves formed in the surface of the driving roller, in which the yarn slidingly engages.
  • the yarn is distributed over the bobbin surface by means of periodical travel along the bobbin generatrix.
  • the linear yarn winding speed is kept substantially constant - this being a necessary condition for proper outcome of the operation - but the angular speed of the bobbin decreases linearly.
  • the number of turns wound for each travel stroke of the yarn guide reduces slightly but continuously for each wound layer.
  • the first stage in the intervention cycle which commences with the cutting or breaking of the yarn by the passage of a defective portion through the yarn clearer is the braking of the bobbin so that its speed decreases to zero.
  • the brake must therefore absorb the kinetic energy possessed by the rotating bobbin, and its stoppage time is substantially proportional to said kinetic energy.
  • the bobbin is braked by a mechanical shoe brake - or equivalent type - operated by pressurised fluid such as compressed air, which is distributed by a solenoid valve which operates following the yarn discontinuity signal.
  • the drive roller is provided with its own braking devices, such as an inverter acting on its drive motor. To prevent damage to the bobbin it is desirable that the two braking actions take place independently, by withdrawing the bobbin and roller away from each other when the yarn discontinuity signal occurs at the commencement of the intervention cycle (US-A-4 195 790).
  • the bobbin and driving roller are allowed to rotate under inertial force a longer time when the bobbin is larger, and the brake is caused to operate only when the inertial rotation of the bobbin driving roller is reduced to a level at which no damage of the yarn can occur.
  • the operations subsequent to the bobbin stoppage i.e. the steps for knotting the broken or interrupted yarn, can take place only when the bobbin is at rest.
  • the duration of the intervention cycle is fixed and is divided into a fixed time available for bobbin stoppage and a fixed time for executing the other operations to be carried out during the intervention. After the stoppage time has passed, the bobbin must be completely at rest because otherwise the other intervention operations cannot be properly carried out, for instance it would be impossible to grip the end of the yarn on the bobbin if this is still rotating.
  • the drive and control unit for the members which sequentially carry out the various operations of the intervention cycle is a mechanical system - such as a shaft provided with a series of cams so that when rotated, said cams sequentially provide the drives for the various members, which consequently operate in sequence (US-A-2 733 870) - or an equivalent electrical control system.
  • the time taken by those preliminary operations which can be carried out while the bobbin is still moving is longer than the bobbin stoppage time, and there are therefore no problems.
  • the fixed time allowed for bobbin stoppage must therefore correspond to the time required for absorbing the maximum kinetic energy which the bobbin can possess, and thus to its maximum possible winding speed, its maximum possible size and its maximum possible density. This time must then be increased by a certain safety margin to take account of any reduction in the efficiency of the braking system.
  • the deriving technical problem with which the present invention deals is to assign a bobbin stoppage time within the intervention cycle which is no longer fixed but is variable, and corresponds substantially to the time which the braking device would require at any given moment to bring the bobbin to rest, this time depending on the kinetic energy of the bobbin at the moment of this operation.
  • the present invention consists therefore of a winding method which is essentially based on:
  • the time required for halting the bobbin is therefore unequivocally determined by its state of progress - once the braking torque of the braking device is known.
  • the bobbin stoppage time, and the kinetic energy which it possesses, depend therefore both on initially assigned parameters, namely:
  • a further indication of the state of progress of the bobbin is the number of revolutions undergone by the bobbin from the commencement of its formation. This indication is a a function of the preceding but not in accordance with a linear relationship as the angular speed of the bobbin decreases with increase in its diameter.
  • the first part of the intervention cycle which commences on receipt of a signal indicating yarn discontinuity - either because it has been cut intentionally by the yarn clearer, or because it has broken naturally or because the feed package is empty - consists of the following main stages:
  • All these three operations are related to each other and are controlled either electrically, for example by means of a solenoid valve operating with compressed air, or mechanically by means of a rotary shaft provided with cams.
  • the various operations concerned and the devices which implement them proceed without rigid time relationship with the second part of the intervention cycle.
  • the second part of the intervention cycle can commence either simultaneously with the first - if no delay instruction has been transmitted by the delay identification unit - or with a delay in accordance with the instructions from said delay identification unit.
  • the second part of the intervention cycle consists of the following main stages:
  • stages of the second part can also be controlled mechanically, such as by a rotary shaft provided with a series of cams which gradually operate the controls for the devices implementing the aforesaid steps, or by equivalent electrical or electronic devices.
  • the state of progress of the bobbin under formation is measured in terms of the length of yarn already wound on the bobbin.
  • indications of the state of progress of the bobbin under formation can be the number of revolutions undergone by the bobbin, the ratio of the number of revolutions undergone by the bobbin to the number of revolutions undergone by the drive roller, the angular speed of the bobbin, its radius and so on.
  • the measured value of the bobbin state of progress is expressed in analog or digital form and fed to the unit for identifying the time delay to be assigned.
  • the identification of the delay to be assigned is determined in the following manner.
  • time series can be set:
  • stoppage times For that particular winding operation, the following stoppage times must for example be left available: for up to 16,000 metres of wound yarn a stoppage time of 2 seconds, from 16,000 to 25,000 meters of wound yarn a stoppage time of 3 seconds, from 25,000 to 33,000 metres of yarn a stoppage time of 4 seconds, from 33,000 to 40,000 metres of yarn a stoppage time of 5 seconds.
  • the delay identification unit therefore contains a set of data relating to the winding parameters as shown in Table 1 hereinafter by way of example.
  • the identification unit receives either continuously or at discrete time intervals data regarding the bobbin state of progress and compares these with the values of the state of progress/delay series.
  • the identification unit sets the delay value between the two parts of the intervention cycle at 1 second in the timer provided in the control unit (so increasing the time available for stoppage to 3 seconds); if the bobbin state of progress exceeds h1 metres the identification unit sets the delay value to 2 seconds, and so on.
  • this set of values is fed into the memory of the processor on the machine.
  • Figure 4 shows a typical arrangement of a device for implementing the method of the invention.
  • the bobbin 1 under formation the tube of which is engaged in the fixing centres of a bobbin carrier arm 2, rests against a drive roller 3 which rotates at constant speed driven by a motor 4 by way of a toothed belt drive 5.
  • the bobbin 1 is therefore rotated by the roller 3 and winds the yarn about itself, its diameter increasing gradually.
  • a sensor 8 for measuring the number of revolutions undergone by the roller 3, and its speed.
  • Each winding station - commonly known as the winding head or simply head - is provided with a microprocessor MP connected to the machine processor or head computer CT; said microprocessor MP is connected to the following: to a brake control FREN which operates the brake 6 by the solenoid valve 7 and operates the other members which implement the braking cycle; to a sensor 8, from which it obtains the length of yarn wound by processing the signal obtained by the sensor 8 itself; to a yarn sensor SENS which, when it detects a yarn discontinuity, feeds to the microprocessor MP the intervention cycle initiation signal; to an inverter INV to which it feeds stop and start signals for the motor 4 and thus for the roller 3, and to a joining control GIUNZ which sequentially activates the various members which implement the joining cycle.
  • the delays with which the joining control GIUNZ is activated are determined by a timer device incorporated in the microprocessor MP but not indicated on the figure.
  • FIG. 5 A functional scheme is shown in Figure 5.
  • the logic diagram for the method is shown in Figure 6, and is described hereinafter together with the commands executed.
  • the CT memories contain the parameters for the delays ⁇ t1, ⁇ t2 ....as a function of the yarn length m lim1 , m lim 2, ...in accordance with the example given in Table 1. These yarn length limits can be calculated or determined on sample bobbins and are a function of the winding speed, the yarn count, the bobbin radius and its density.
  • the microprocessor of the winding head concerned reads these pairs of values.
  • the bobbin/roller assembly is braked, each independently by its own brake, and the length m of yarn already wound on the bobbin is measured. This value is compared in sequence with the series of limiting values m lim1 , m lim2 ... to find the minimum value of m lim which still exceeds the measured value m, and the corresponding delay ⁇ t is used.
  • the microprocessor is not required to compute but only to make a series of comparisons between the yarn length measured at the moment of the break in continuity of the yarn and the memorised series of m lim values.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)

Claims (6)

  1. Procédé de bobinage comprenant des cycles qui sont destinés à rétablir la continuité du fil et par lesquels la bobine est stoppée et les extrémités du fil discontinu sont raccordées l'une à l'autre, lesdits cycles étant divisés en deux parties, la première partie étant consacrée au freinage de la bobine et la seconde partie étant consacrée au raccordement des extrémités du fil, caractérisé en ce qu'entre le début de la première partie et le début de la seconde partie des cycles de rétablissement de la continuité du fil est interposé un retard variable que l'on détermine à tout moment donné en se basant sur l'état de progression de la bobine mesuré au moment du début du cycle, ledit état de progression de la bobine étant défini par la longueur du fil déjà enrouleé sur la bobine.
  2. Procédé de bobinage selon la revendication 1, caractérisé en ce que l'on détermine la longueur du fil déjà enroulée sur la bobine en comptant le nombre de tours d'un galet d'entraînement de bobine depuis le début du bobinage.
  3. Procédé de bobinage selon la revendication 1, caractérisé en ce que l'on détermine l'état de progression de la bobine en mesurant le temps de bobinage utile en partant du début du bobinage.
  4. Procédé de bobinage selon la revendication 1, caractérisé en ce que l'on détermine le retard devant être interposé entre le début de la partie freinage et le début de la partie raccordement des cycles en comparant la longueur du fil déjà enroulée sur la bobine avec une série de valeurs prédéterminées de limitation de ladite longueur auxquelles sont associées respectivement des valeurs de retard prédéterminées et on adopte le retard qui est associé à la valeur minimale dans la série de valeurs de limitation de longueur qui est encore plus grand que ladite longueur déjà enroulée.
  5. Procédé de bobinage selon la revendication 4, caractérisé en ce que la série de valeurs de retard devant être introduite entre le début des deux parties des cycles consiste en une série discrète d'intervalles de temps croissants.
  6. Procédé de bobinage selon la revendication 5, caractérisé en ce que le premier terme de la série de valeurs de retard est zéro.
EP88202368A 1987-11-13 1988-10-25 Procédé de bobinage Expired EP0316977B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2262587 1987-11-13
IT22625/87A IT1223118B (it) 1987-11-13 1987-11-13 Procedimento perfezionato di roccatura e dispositivi per la realizzazione di detto procedimento

Publications (2)

Publication Number Publication Date
EP0316977A1 EP0316977A1 (fr) 1989-05-24
EP0316977B1 true EP0316977B1 (fr) 1992-06-03

Family

ID=11198573

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88202368A Expired EP0316977B1 (fr) 1987-11-13 1988-10-25 Procédé de bobinage

Country Status (5)

Country Link
US (1) US4957244A (fr)
EP (1) EP0316977B1 (fr)
DE (1) DE3871727T2 (fr)
ES (1) ES2034169T3 (fr)
IT (1) IT1223118B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4434610B4 (de) * 1994-09-28 2005-07-21 Saurer Gmbh & Co. Kg Verfahren und Vorrichtung zum Wickeln eines Fadens
DE4441276A1 (de) * 1994-11-19 1996-05-23 Schlafhorst & Co W Verfahren zum Wickeln einer Auflaufspule

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3988879A (en) * 1974-07-08 1976-11-02 Nuova San Giorgio S.P.A. Method and apparatus for yarn length measuring
US4195790A (en) * 1975-09-27 1980-04-01 W. Schlafhorst & Co. Method and device for discontinuing operation of a winding device after a thread break occurs
DE2849061C2 (de) * 1977-11-17 1986-09-25 Hollingsworth (U.K.) Ltd., Accrington, Lancashire Verfahren zum Stillsetzen einer OE- Rotorspinnmaschine und OE-Rotorspinnmaschine
US4163358A (en) * 1978-01-19 1979-08-07 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Apparatus for controlling the driving of an open-end spinning machine
JPS5623172A (en) * 1979-07-27 1981-03-04 Murata Mach Ltd Controller for thread connection in automatic winder
JPS606864B2 (ja) * 1979-07-19 1985-02-21 村田機械株式会社 自動ワインダ−におけるパツケ−ジ停止方法

Also Published As

Publication number Publication date
DE3871727T2 (de) 1992-12-10
IT8722625A0 (it) 1987-11-13
IT1223118B (it) 1990-09-12
US4957244A (en) 1990-09-18
DE3871727D1 (de) 1992-07-09
ES2034169T3 (es) 1993-04-01
EP0316977A1 (fr) 1989-05-24

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